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1. Why must researchers ensure that their experimental groups are roughly equivalent before manipulating the independent variable?
2. Discuss the relative advantages and disadvantages between within-subjects designs and between-subjects designs.
Review the five steps of hypothesis testing and complete the following problems.
A study sponsored by American Express Co. and the French government tourist office found that old American stereotypes about French unfriendliness weren't true.
He argues that the regression effect says people who perform very poorly in their previous job tend to perform well in their next job. Is this what the regression effect says? Explain.
Let"s consider the very large database of individual incomes from the Bureau of Labor Statistics as our population. It is strongly right skewed. How large a sample size?
write down the hypothesis the test used the p-value and the interpretation then hand calculates a 95% CL for the odds ratio estimate on this last test.
a researcher reports the following equation for a best-fitting straight line to a set of data points ycirc?1.01x3.24.
if a sample is subdivided into subsamples a minimal sample size of 30 is necessary for every subsample?a. trueb.
Suppose that (X1, Y1, Z1) = (7.0, 2.5, 1.9),(X2, Y2, Z2) = (6.3, 9.6, 4.1), (X3, Y3, Z3) = (6.9, 3.7, 12.4), (X4, Y4, Z4) = (3.6, 12.1, 6.5), (X5, Y5, Z5) = (9.0, 6.4, 11.2), (X6, Y6, Z6) = (3.0, 6.2, 7.7), and (X7, Y7, Z7) = (4.2, 0.4, 8.2) represe..
an insurance company would like to estimate the average liability dollars that they pay out due to automobile accidents
Assume that the variable B is the number of years of experience. Suppose the person has 2 years of college and 7 years of experience. What should their salary be?
In a survey about soft drinks it was found that 5% of the respondents like diet soft drinks. 12% of the respondents like the brand Coke. Of the diet soda drinkers, 40% like Coke. What is the probability that a respondent did like diet drinks or di..
An education specialist is considering the use of instructional material on compact discs for a special class of third-grade students with reading disabilities.
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